Dear all
I upgraded a server from Ubuntu 15.10 to 16.04. All went smoothly and the
machine appeared in good state. However, there seems to be a problem with LVM.
I have one volume group with several logical volumes. lvs showed all the
logical volumes but only 2 of the 7 volumes were active (and appearing in
/dev/mapper).
I activated the other volumes using lvchange -ay and then I can see all logical
volumes in /dev/mapper.
However, there appear to a problem with some of the LVs which are used as the
images for virtual machines (qemu-kvm). The VMs don't boot. Moreover,
previously I could mount the sub-partitions of the LV by doing a kpartx -a on
the logical volume. That no longer works (e.g. kpartx -l
/dev/mapper/cloud-VNAME shows nothing, while it used to show the 3 partitions
of the underlying virtual machine).
One of the LVs didn't have a problem -- this just contained a data disk.
This particular server is not a serious problem for me because I can clone the
VM from elsewhere, but I am about to start an upgrade of all our other machines
and it will be very time-consuming if I have to do this with each machine.
Does anyone have any ideas about what went wrong? How the situation could be
remedied
Thanks
Scott=
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